The function of electrons with high energy in the electron transport chain are too provide the energy needed to pump ions across the membrane.
The electron transport chain occurs within the mitochondria of the cells, to be more specific, on the inner membrane of the mitochondria. This process is responsible for the production of energy needed for life to be possible and is where the mitochondria gets it's famed "powerhouse of the cell" title.
The high energy electron given off by NADH and FAD2 are used in the electron transport chain to pump hydrogen ions into the inter membrane space. These then form a higher concentration and cause diffusion to occur, which later leads to the production of ATP (Energy used by cells).
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